311323681 has 2 divisors, whose sum is σ = 311323682. Its totient is φ = 311323680.

The previous prime is 311323679. The next prime is 311323709. The reversal of 311323681 is 186323113.

It is an a-pointer prime, because the next prime (311323709) can be obtained adding 311323681 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249166225 + 62157456 = 15785^2 + 7884^2 .

It is a cyclic number.

It is not a de Polignac number, because 311323681 - 2¹ = 311323679 is a prime.

It is a super-2 number, since 2×311323681² = 193844868702779522, which contains 22 as substring.

Together with 311323679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (311326681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155661840 + 155661841.

It is an arithmetic number, because the mean of its divisors is an integer number (155661841).

Almost surely, 2^311323681 is an apocalyptic number.

It is an amenable number.

311323681 is a deficient number, since it is larger than the sum of its proper divisors (1).

311323681 is an equidigital number, since it uses as much as digits as its factorization.

311323681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 311323681 is about 17644.3668347719. The cubic root of 311323681 is about 677.7518612613.

Adding to 311323681 its reverse (186323113), we get a palindrome (497646794).

The spelling of 311323681 in words is "three hundred eleven million, three hundred twenty-three thousand, six hundred eighty-one".